I recently resealed my exposed aggregate driveway with SuperSeal 25 and after 2 coats, I still found small holes and pockets from "popped" pieces of gravel. Last fall, I stripped my driveway, but was unable to seal the concrete before the freezing weather started. So, now it has 2 coats of "great sealer" on it... Do you have any suggestions so that I can avoid another winter that virtually destroys my 4 year old driveway?